Adjustable joint



May 28, 1940. M. J. 'DRACHMANY ET AL 2,202,195,

1 ADJUSTABLE JOINT v Filed Oct. 10, 1936 ZSheets-Sheet 2 ISnnentor arm.

Patented May 28, 1940 PATENT OFFICE ADJUSTABLE JOINT Myron Drachman andKurt Stoye, New York, N. Y., assignors to Peerless Laboratories Inc.,

New York, N. Y.

Application October 10, 1936, Serial No. 105,060

1 Claims. (61.282-14) This invention relates to improvements inelectrodes for use in short wave therapeutic treatments. The term shortwave is used to designate electrical currents of frequencies from tenmillion cycles per second and higher as applied to medical treatment oruses. The invention applies particularly to waves of a frequency ofthirty million cycles per second or higher cor-- responding to awavelength of ten meters or less.

-More specifically the invention consists of a convenient andpracticable means for supporting condenser type short wave electrodes sothat 7 these may be readily adjusted to any part under treatment andretained in their proper positions during treatment, in relativesecurity. Another function of the invention is to provide a relativelyfixed but adjustable-distance of the elect'rode from the surface of thepart being treated, substantially without the interposition of any solidsubstance, so as to avoid any distortion of the electric field bychanging the dielectric values between the patient and condenserelectrodes;

for this purpose the electrode is provided with a guard, the latterbeing designed to permit positioning of the condenser electrode in thevery plane of the edge of the guard.-

The invention is illustrated in the accompanylng drawings, showing apreferred embodiment of the invention, in which: Figure 1 is anassembled view of a supporting arm and the electrode carried thereby,parts of the arm and the electrode being in longitudinal section.

. Figure 2 is a view of a joint between relatively 35 movable parts ofthe supporting arm, the joint being shown in longitudinalsection.

I Figure 3 shows-another type of joint with parts thereof insection.This joint is intended primarily for anchoring the electrode arm \to abase- 40 of any suitable form, or a wall. v

Figure 4 shows another type of jointto be used between relativelymovable parts of the'electrode Figure 5 shows a pair of electrodesupporting i5 arms mounted upon a pedestal.- I

In Figure 1 are shown supporting members I and 2- provided withfrictionally controlled swivels I, I, and 5, the extreme swivel having asupporting member or flange which may be se-' 0 cured to a relativelyrigid body such as a wall, tripod, base or cabinet. At the otherextremity a form of bail and socket universal. Joint 6- is mounted andpermits freedom of motion inany direction to the electrode I which islocated at 55 the extremity of-a hollow dielectric-shaft 8 passingthrough the ball. This nal portion of 22.

more apertures in its circumference and between shaft contains aconductor through which current passes from the treatment cableoriginating at the terminal of the short wave generator tothe insulatedme-. tallic condenser plate 9. The adjustable treat- 5 ment spacer orguard consists of a ring I0 mounted on extension members II and slidingmember. l2 which may be secured by a locking device l3. If the ring beplaced against the surface to be treated and the locking device clampedagainst the shaft, the electrode will not. approach the surface closerthan the predetermined rela-.j tive positiona For the frictionallycontrolled swivels and-- joints in the am, we elect to employ a typeunique in the art, three forms of which are illustrated sectionally inFigures '2, 3, and 4. In Figure 2, the swivel elements 22 and 23 containsockets for securingthe shaft of the arm, and circular portions whichare clamped together by bolts '14 and i5. Attached to a circular portionof 23 but capable of some relative axial motion is friction plate ormeans 16 and elastic washer or means which may be of rubber. When thebolts l4 and lSare tightened, the' swivel element 25 is clamped betweenfriction plate l8 and swivel results in a smooth and readily adjustablefriction between the two elements of the swivel. A retainer" l9is'provided for the elastic washer ll. InFigure 3,22 is, a smooth ringsuitably se-.

cured at oneend and carrying avertical slot on the'other. I screw [4passes thru this slot and with its nut. secures sliding portion 23 whichcontains a socket for supporting an arm. 22 is I thus permitted acircular motion in the vertical plane of the ring. Screw I 4 withitsnut. further 40 .compresseselastic member I 1 between retainer I! andafriction facing thereby causing an easily regulated frictional forcebetween 23 with attached parts and ring 22. v

In Figure 4", swivel portions or arms 22 and 23 bear on one another thrucylindrical bushing or shell 2| which fits smoothly within a hollowjour- Thebushing 2| has one or its ends, in each of which, is fitted afriction member forming friction means. Two such friction members it andII are ,shownin the sec-1.7g

tional view of Figure 4, but'obviously any sultable number may beprovided. Elastic bushing cular portion of 23 thereby causing frictionmembers I 6 and I8 to be pressed outwardly against the insidecylindrical surface of the hollow portion of arm 22. The amount offriction is easily adjusted by means of screw ll. Bushing or tubeprevents H from pressing against the screw M which would tend to causebinding.

In all of designs above the elastic member must be provided with asuitable retainer to prevent expansion 'or frictional pressure exceptwhere needed to cause friction.

In Figure 5, a pair. of electrodes, with their supporting arms areswivably mounted on a commonsupport 2|.

The invention described herein is intended for use with the short wavetherapeutic apparatus shown and claimed in a copending applicationSerial Number 105,059, filed October 10, 1936.

What we claim as novel and desire to secure by Letters Patent is:

1. An adjustable swivel joint comprising two members one of which ismovable relatively to the other, a friction surface upon one member,rubber-like elastic means, and means to completely enclose and confinethe rubber-like elastic means including a friction means engaging thefriction surface and the rubber-like elastic means, and means tocompress the rubber-like elastic means in one direction whereby thefriction means is pressed against the friction surface laterally withrespect to the direction of compressionof the rubber-like elastic means.

2. An adjustable swivel joint comprising two members one of which ismovable relatively to the other, one of said members having a boretherein to provide a cylindrical friction surface, a cylindrical shellwithin the bore and having at least one aperture therein, a frictionmeans within each aperture and engaging the friction surface, arubber-like elastic means within the shell and engaging the frictionmeans, and means including the other relatively movable member tocompress the rubber-like elastic means axially whereby the frictionmeans is pressed radially against the friction surface.

3. An adjustable swivel joint comprising two members one of which ismovable relatively to the other, one of said members having a boretherein to provide a. cylindrical friction surface,

a cylindrical shell within the bore and having at least one aperturetherein, a friction means within each aperture and engaging the frictionsurface, a tubular rubber-like elastic means within the shell andengaging the friction ineans, a boss upon the other relatively movablemember received within one end of the shell and engaging the rubber-likeelastic means, a washer having a boss received within the other end ofthe shell and engaging the rubber-like elastic means, a tube receivedwithin the tubular rubber-like elastic means, and a bolt passing throughthe tube and engaging the second member and the -member, friction meansengaging each friction surface and having a boss received within thebore, rubber-like elastic means engaging one of the friction means, andmeans to compress the rubber-like elastic means whereby the frictionmeans are pressed against the friction surfaces.

5. An adjustable swivel joint comprising a first member having acylindrical bore therein and a flat friction surface upon opposite facesof the member, a second member having a boss swivably received in thebore of the first member and engaging a friction surface, friction meansengaging the other friction surface, rubber-like elastic means engagingthe friction means, and means including a washer to enclose andcompressthe rubber-like elastic means whereby the friction means and thesecond member are pressed against their respective friction surfaces.

6. An adjustable swivel joint comprising two overlapping members one ofwhich is movable relatively to the other, a hole through one of saidmembers, bolt means adjustably carried by one of said members andpassing through said hole for adjustably connecting said memberstogether, and elastic rubberlike means carried by and its compressionselectively adjusted by said bolt means to operatively vary the frictionbetween said relatively movable members. v

'I. An adjustable swivel joint comprising two overlapping members one ofwhich is pivotally movable relatively to the other, a cylindrical holethrough one of said members, means carried by the other member engagingthe hole so that the axis of the hole is the axis of the pivotalmovement between the members, bolt means adjustably carried by the nextaforesaid 'means and passing through said cylindrical hole forconnecting said members together, and elastic rubberlike means carriedby said bolt means and operative to vary the friction between saidrelatively movable members.

' KURT STOYE.

MYRON J. DRACHMAN.

